继承人类不工作

Question

我用基类Person

创建了一个继承类

Person.h

#include <iostream>
#include <string>

using namespace std;

class Person 
{
    friend ostream& operator<<(ostream &os, const Person &p);
    friend istream& operator>>(istream &is, Person &p);
private:
    char* m_name;
    int m_age;
    string m_ssn;
protected:
    virtual void Read(istream &is);
    virtual void Write(ostream &os) const;
public:
    Person();
    Person(const char* const name, int age, const string &ssn);
    Person(const Person &p);
    ~Person();
    Person & operator = (const Person& other);
    virtual string getName() const;
    virtual int getAge() const;
    virtual string getSSN() const;
    void setName(const char* const name);
    void setAge(int age);
    void setSSN(string ssn);
    string getType() const;
};

Person.cpp

#include <iostream>
#include <string>
#include "Person.h"

using namespace std;

ostream& operator<<(ostream &os, const Person &p)
{
	p.Write(os);
	return os;
}

istream& operator>>(istream &is, Person &p)
{
	p.Read(is);
	return is;
}

Person::Person()
{
	m_name = new char[10];

	for (int i = 0; i < 10-1; i++)
	{
		m_name[i] = 'X';
	}
	m_name[10 - 1] = '\0';

	m_age = 0;
	m_ssn = "XXX-XX-XXXX";
}

Person::Person(const char* name, int age, const string &ssn)
{
	m_name = new char[(int)strlen(name)+1];

	for (int y = 0; y < (int)strlen(name); y++)
		m_name[y] = name[y];
	m_age = age;
	m_ssn = ssn;
}

Person::Person(const Person& P)
{
	m_name = new char[(int)strlen(P.m_name)+1];

	for (size_t i = 0; i <= (int)strlen(P.m_name); i++)
	{
		m_name[i] = P.m_name[i];
	}
	m_age = P.m_age;
	m_ssn = P.m_ssn;
}

Person::~Person()
{
	delete[] m_name;
}

Person& Person::operator=(const Person& other)
{
	if (this == &other)
		return *this;
	delete [] m_name;

	m_name = new char[(int)strlen(other.m_name) + 1];
	for (int i = 0; i <= (int)strlen(other.m_name); i++)
	{
		m_name[i] = other.m_name[i];
	}

	m_age = other.m_age;
	m_ssn = other.m_ssn;
}

string Person::getName() const
{
	return string(m_name);
}

int Person::getAge() const
{
	return int(m_age);
}

string Person::getSSN() const
{
	return string(m_ssn);
}

void Person::setName(const char* const name)
{
	delete[] m_name;
	m_name = new char[(int)strlen(name) + 1];

	for (int i = 0; i <= (int)strlen(name); i++)
	{
		m_name[i] = name[i];
	}
}

void Person::setAge(int age)
{
	m_age = age;
}

void Person::setSSN(string ssn)
{
	m_ssn = ssn;
}

string Person::getType() const
{
	return string("Person");
}

void Person::Write(ostream &os) const
{
	if (&os == &cout)
	{
		os << "Name: " << m_name << "\nAge: " << m_age << "\nSSN: " << m_ssn;
	}
	else
		os << m_name << "\n" << m_age << "\n" << m_ssn;
}

void Person::Read(istream &is)
{
	string name;
	if (&is == &cin)
	{
		cout << "Enter the Name: " << flush;
		getline(is, name);
		if (name.length() == 0)
			getline(is, name);
		cout << "Enter the Age: " << flush;
		is >> m_age;
		cout << "Enter the SSN: " << flush;
		getline(is, m_ssn);
		is.get();
	}
	else
	{
		getline(is, name);
		if (!is)
			return;
		if (name.length() == 0)
			getline(is, name);
		is >> m_age;
		getline(is, m_ssn);
		is.get();
	}
	delete[] m_name;
	m_name = new char[name.length() + 1];
	for (int i = 0; i < (int)name.length(); i++)
	{
		m_name[i] = name[i];
	}
	m_name[name.length()] = '\0';
}

我甚至不会放入继承类，即Student，因为我在测试Person类时已经出错了。

我在我的主要内容中试过以下内容：

#include "Person.h"
#include "Student.h"

int main()
{

	Person ptr2Stu("Joe", 22, "123-45-6678");
	cout << ptr2Stu.getName() << endl;
	cout << ptr2Stu.getAge() << endl;
	cout << ptr2Stu.getSSN() << endl;
	cout << ptr2Stu.getType() << endl;

	system("pause");
}

尝试构建时会收到错误。

Answer 1

Person.cpp

存在问题

Person::Person(const char* name, int age, const string &ssn)

在头文件中，声明是

Person(const char* const name, int age, const string &ssn);
                    ^^^^

因此，更改声明/定义中的任何一个。

您可以在getSSN和getAge中省略类型转换。